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[RFC,for-next,1/4] bio: safeguard REQ_ALLOC_CACHE bio put

Message ID 558d78313476c4e9c233902efa0092644c3d420a.1666114003.git.asml.silence@gmail.com (mailing list archive)
State New, archived
Headers show
Series enable pcpu bio caching for IRQ I/O | expand

Commit Message

Pavel Begunkov Oct. 18, 2022, 6:47 p.m. UTC
bio_put() with REQ_ALLOC_CACHE assumes that it's executed not from
an irq context. Let's add a warning if the invariant is not respected,
especially since there is a couple of places removing REQ_POLLED by hand
without also clearing REQ_ALLOC_CACHE.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
 block/bio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/block/bio.c b/block/bio.c
index 7cb7d2ff139b..5b4594daa259 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -741,7 +741,7 @@  void bio_put(struct bio *bio)
-	if (bio->bi_opf & REQ_ALLOC_CACHE) {
+	if ((bio->bi_opf & REQ_ALLOC_CACHE) && !WARN_ON_ONCE(in_interrupt())) {
 		struct bio_alloc_cache *cache;